move to components directory

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@634 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/dfs/src/dfs_init.c

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+/*
++------------------------------------------------------------------------------
+| Project   : Device Filesystem
++------------------------------------------------------------------------------
+| Copyright 2004, 2005  www.fayfayspace.org.
+| All rights reserved.
+|------------------------------------------------------------------------------
+| File      : dfs.c, the implementation of Device FileSystem
+|------------------------------------------------------------------------------
+| Chang Logs:
+| Date           Author       Notes
+| 2002-12-31     ffxz         The first version.                     
+| 2005-01-22     ffxz         Clean up the code.                     
++------------------------------------------------------------------------------
+*/
+#include <dfs_def.h>
+#include <dfs_config.h>
+
+#include <dfs_fs.h>
+#include <dfs_raw.h>
+
+#include <string.h>
+
+/* Global variables */
+struct dfs_filesystem_operation* filesystem_operation_table[DFS_FILESYSTEM_TYPES_MAX + 1];
+struct dfs_filesystem filesystem_table[DFS_FILESYSTEMS_MAX + 1];
+
+/* device filesystem lock */
+struct rt_mutex dlock;
+
+#ifdef DFS_USING_WORKDIR
+char working_directory[DFS_PATH_MAX + 1];
+#endif
+
+#ifdef DFS_USING_STDIO
+struct dfs_fd fd_table[3 + DFS_FD_MAX];
+#else
+struct dfs_fd fd_table[DFS_FD_MAX];
+#endif
+
+/*
++------------------------------------------------------------------------------
+| Function    : dfs_init
++------------------------------------------------------------------------------
+| Description : Inits the Device Filesystem
+| Parameters  : null
+| Returns     : null
++------------------------------------------------------------------------------
+*/
+void dfs_init()
+{
+	int index;
+
+	/* clear filesystem operations table */
+	for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX + 1; index++) 
+		filesystem_operation_table[index] = RT_NULL;
+
+	/* create device filesystem lock */
+	rt_mutex_init(&dlock, "dlock", RT_IPC_FLAG_FIFO);
+
+	/* clear filesystem table */
+	rt_memset(filesystem_table, 0, sizeof(filesystem_table));
+
+#ifdef DFS_USING_WORKDIR	
+	/* set current working directory */
+	strcpy(working_directory, "/");
+#endif
+
+	/* clean fd table */
+	rt_memset(fd_table, 0, sizeof(fd_table));
+}
+
+void dfs_lock()
+{
+	rt_err_t result;
+
+	result = rt_mutex_take(&dlock, RT_WAITING_FOREVER);
+	RT_ASSERT(result == RT_EOK);
+}
+
+void dfs_unlock()
+{
+	rt_mutex_release(&dlock);
+}